/*
 * Copyright 2009 by Konstantin Bulenkov
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.bulenkov.crawler;

import java.io.Serializable;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * @author Konstantin Bulenkov (konstantin@bulenkov.com)
 */
public final class CURL implements Serializable {
  private final int depth;
  private final CURL referer;
  private final String url;

  public CURL(String url) throws MalformedURLException {
    this(url, null);
  }

  public CURL(String url, CURL referer) throws MalformedURLException {
    new URL(url);    
    this.url = url;
    this.referer = referer;
    depth = referer == null ? 0 : referer.depth() + 1;
  }

  public int depth() {
    return depth;
  }

  public CURL referer() {
    return referer;
  }

  public String url() {
    return url;
  }

  public String toString() {
    return url + (referer == null ? "" : " <-- " + referer);
  }
}
